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Addition and subtraction within 100 word problems 1

By Khan Academy

Addition and subtraction within 100 word problems 1

By Khan Academy

Addition and subtraction within 100 word problems 1

Adding and subtracting in scientific notation

By Khan Academy

Learn how to subtract numbers written in scientific notation. The problem solved in this video is (4.1 * 10^-2) - (2.6 * 10^-3).

Breaking apart three-digit addition problems

By Khan Academy

Let's think about ways to break up addition problems. This is useful because it might make it easier for us to actually compute the addition.

Axis of symmetry

By Khan Academy

Sal introduces the concept of an axis of symmetry.167

Comparing decimals: difference in largest place value | Decimals | Pre-Algebra | Khan Academy

Confused trying to determine which decimal is larger? Let's compare two decimals in this example. Remember that you're looking for the difference is the largest place value to find the larger decimal.

Comparing linear functions

By Khan Academy

Sal is given a table of values of a linear function and four linear graphs, and is asked to determine which graph increases faster than the function represented in the table.

Compound inequalities

By Khan Academy

Sal solves the compound inequality 5x-3<12 AND 4x+1>25, only to realize there's no x-value that makes both inequalities true.

Compose functions

By Khan Academy

Sal solves the following problem: Given that f(x)=ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½(x^2-1) and g(x)=x/(1+x), find f(g(x)) and g(f(x)).